<?php
    //http://www.111cn.net/callback.php

    require_once('config.php');

    $appid = APPID;
    $secret = SECRET;
    $code = $_GET["code"];
    $get_token_url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.$appid.'&secret='.$secret.'&code='.$code.'&grant_type=authorization_code';
    $ch = curl_init();
    curl_setopt($ch,CURLOPT_URL,$get_token_url);
    curl_setopt($ch,CURLOPT_HEADER,0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
    $res = curl_exec($ch);
    curl_close($ch);
    $json_obj = json_decode($res,true);

    //根据openid和access_token查询用户信息
    $access_token = $json_obj['access_token'];
    $openid = $json_obj['openid'];
    $domain=$_SERVER['SERVER_NAME'];
    $redirect_uri = urldecode('http://' . $_SERVER['HTTP_HOST'] . substr($_SERVER['PHP_SELF'], 0, strrpos($_SERVER['PHP_SELF'], '/api/')) . '/?openid='.$openid);
    header('location:'.$redirect_uri);
?>